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A natural amino acid-doped polyaniline nanostructure was prepared by a simple in situ chemical polymerization method in an aqueous medium. The structure and morphology of composite material were characterized by FESEM, TEM, FT-IR, and XRD. The results showed that the product possesses a large aspect ratio and a hollow tubular morphology. As-synthesized products were further applied to remove dyes and heavy metal ions from the aqueous solution, which exhibited good removal capacity toward Congo red (955.6 mg·g−1) and Cr(VI) (60.0 mg·g−1). The adsorption data for the former were found to be well described by the pseudo-first-order kinetic and Langmuir adsorption isotherm model. Thermodynamic studies show that the adsorption of Congo red by GluP is a spontaneous and endothermic process. Moreover, cyclic experiment results show that the polyaniline composites exhibited good recyclability. Therefore, these amino acid-doped polyaniline nanotubes can be expected to be an ideal candidate for the removal of organic dye and heavy metal ions from wastewater.

As China gradually enters the era of mass tourism, people's tourism consumption demand has changed from low-level and focusing on sightseeing to high-quality, diversified and leisure vacations, which puts forward more requirements for the deep, connotational and high-quality development of tourism. Given that the research on language landscape in tourism is still relatively insufficient, this study tries to investigate the construction of the language landscape in the Juguo ancient city in Shandong Province from the perspective of the tourism language landscape in China. The study found that the language signs in the scenic area are mainly monolingual signs, supplemented by bilingual and trilingual signs; There are three languages in the scenic spot, Chinese, English and Korean, among which Chinese is the priority code, while English and Korean are marginalized codes in the scenic spot language landscape. The management department of scenic spots plays a decisive role in constructing language landscapes, but the business operators have not yet realized the economic value of language landscapes. There are problems in constructing the tourism language landscape in scenic spots, such as insufficient construction of a diversified language landscape, non-standard translation of language signs, and lack of design sense and characteristics of signs. In the future, scenic spot management departments should pay attention to the value of language landscape construction, meet the multilingual needs of tourists, highlight the style and characteristics of language landscape, and regularly carry out language landscape investigation and updates.